Abstract:
:The current studies were designed to explore the effects of C-receptor-binding atrial natriuretic peptide analogues on serum-induced mitogenesis in cultured rat aortic smooth muscle cells. To this end, rANF99-126 and a series of truncated (rANF103-126, rANF103-125), ring-deleted (des[Gln116, Ser117, Gly118, Leu119, Gly120]rANF102-121-NH2 (c-ANF) and linear des(Cys105, Cys121)rANF104-126 peptide analogues were used. The latter two peptides have been reported to be selective for the ANF-C receptor. In cells subcultured between passage 3 to 19, rANF99-126, rANF103-126, and rANF103-125 concentration-dependently (0.1-1000 nM) inhibited serum-induced (3H) thymidine incorporation with maximal inhibition observed at 1 microM for each peptide (approximately 40, 31 and 56%) respectively. Furthermore, des[Cys105, Cys121]rANF104-126 inhibited serum-induced (3H)thymidine incorporation concentration-dependently without altering basal or elevated cellular cAMP or cGMP levels. Moreover, the reduction in thymidine incorporation was associated with inhibition of serum-induced clonal cell proliferation. In contrast, c-ANF failed to inhibit serum-induced mitogenesis, yet at a concentration of 100 nM it antagonized the antimitogenic effects of des[Cys105, Cys121]rANF104-126 or rANF99-126 without having any effect on basal or elevated cellular cyclic nucleotide levels. We conclude that the antimitogenic effect of atrial peptides is mediated through interaction with the ANF-C receptor and may be independent of changes in cellular cyclic nucleotide levels.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Cahill PA,Hassid Adoi
10.1016/0006-291x(91)91758-5subject
Has Abstractpub_date
1991-09-30 00:00:00pages
1606-13issue
3eissn
0006-291Xissn
1090-2104pii
0006-291X(91)91758-5journal_volume
179pub_type
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